Updating versions for 3.0

Most of the actual version numbers are derived from the git tag, but we do
have the fallback hard-coded in the Makefile (e.g. for people building
from a source tar-ball).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Disable Croation and Italian translations

About 220 strings are missing from each of them - it's better to give
people a consistent English experience than a half-translated one.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Correctly capitalize JDiveLog

Suggested-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>